Improved emacsclient scripts

emacsclient-main is used for Firefox' "It's all text" add-on
Updated .gitignore
Visual-line-mode and line-wrapping
More LaTeX-specific features

- replace text with an equivalent macro throughout the document
- align columns in a tabular environment
Also count words with M-=
Exchange elisp sections and subsection in iMenu
Minor modifications
Updated isend version